Felix N created HDFS-17878:
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Summary: Reduce frequency of getDatanodeListForReport calls for
metrics
Key: HDFS-17878
URL: https://issues.apache.org/jira/browse/HDFS-17878
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Felix N
Assignee: Felix N
getDatanodeListForReport is called by a lot of metrics method while holding
synchronized lock, interfering with more critical ops like datanodeReport while
not having critical data (metrics). Best to reduce the frequency of calls to
this method.
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